Process for coloring hardened masses made from casein and other protein substances



Patented Aug. 6, 1935 I y UNITED STATES PATENT OFFICE PROCESS FOR COLORING HARDENED MASSES MADE FROM CASEIN AND OTHER PROTEIN SUBSTANCES Henri Dumont, Hamburg, Germany, assignor to firm Internationale Galalith-Gesellschaft Hoff & 00., Harburg-Wilhelmsburg (Elbe), Germany No Drawing. Application June 29, 1931, Serial No. 547,798. In Germany. September 2, 1930 2 Claims, (01. 8-5) It has hitherto not been possible to color casein producing the coloring of the hardened casein in artificial horn made of casein and other proartificial horn by a reaction therein. tein substances and of material rich in protein .A special method of carrying out the present matter, such as yeast and the like, by kneading process consists in first of all treating the hardunder pressure the moistened starting material ened material with a metal salt solution and then 5 into a plastic mass and subsequently hardening subjecting it to the action of a chemically rethe same in a formaldehyde bath. The coloring acting substance in gas or bath form, whereby materials proper are fixed from the solution on the colorings are formed or changed owin to the surface of the material. when only thin the chemical reaction. Particularly ammonium 10 layers are rubbed off, and consequently when the ulph de, yd sulphide end the like come 10 superficially colored articles of casein artificial into consideration for such after-treatment.

horn and the like are used, the color disappears In these various modifications, the Solutions o e and more until soon quite colorless spots adapted for coloring the hardened artificial horn appear. In order to produce casein artificial p t ate int th latt r; in sp ia cases, the

16 horn, moistened casein is kneaded with or withcooperation of electrolytes may be resorted to out the addition of coloring and filling materials for accelerating the p e rat on. of the s usubjected to heat and high pressure, the resultt O e e e y y he added to the ing plastic mass is pressed into rods, plates and lution but they may also be mixed with the casein molded articles and then hardened and dried by W Producing the casein mass- 20 remaining in the formaldehyde bath for some Not only can uniformly colored pieeesbe made 20 time. Solutions of dyestuffs do n t penetrate in the said manner, but marbled pieces as well. into the finally hardened artificial horn pro- T s u i na ts di ntly n th difi t y duced in the said usual or .a similar manner so colored parts in the mal'hled messes 80 that that it is impossible to subsequently color or rem d mas s again orm dcolor hardened artificial horn throughout the In general the transparency of theherdened mass by using solutions of dyestuffs. masses treated according to the present process The present invention consists of a process of is completely retained. subsequently coloring or re-coloring finally hard- The pr s p o s is of pa t ul r e o m c ened casein artificial horn. Solutions of soluble advantage Owing t the f ct that the Stock of 0 heavy metal salts serve as coloring agents whi h diflerently colored masses. may be substantially are adapted to penetrate into and throughout lessened, Smce (lefimte 3019111135 may be the artificial horn. The solutions of such heavy ecut'ed tlme accordmg 0 the Present metal salts, which have a natural color, such as pmcess readuy and without great cost- Not only 85 copper salts, chromium salts, uranium salts, cogi and mdshbut blocks and Shaped afticles '5 balt mercury thiocyanate, impart to the hardmay be homughly comma accordmg ened casein artificial horn a coloring similar fins t 8 new process also to the natural coloring the solutions of other ther partwular technical advantage owmg to the a fact that when treated with thoroughly coloring heavy metal salts such as mercuric nitrate alsolutions the finished product is less water at- 40 low of effect .being produced by tractive than the masses colored in the hitherto action with the casein. known manner Extremely satisfactory utilizable colorings are I m, obtained by treating the hardened casein artl- 1, A pfoces of thomwmy coloring hardened fieial horn by m ns O solutions eomplex mcasein, artificial horn consisting in treating the pounds of the heavy metal salts such as copper hardened artificial horn with aqueous solutions oxide ammonia, cobaltammine (cobaltiac) and of heavy metal salts.- the like, also such which contain inorganic and A Pr r l to claim n which is organic elements such as acetate and carbonate used complex salts of the heavy metals for residues. 1 th r ushly coloring the artificial horn. w

A special modification of the invention resides HENRI DUMONI. 

